Pantograph.



no. 311,333. PATENTBD- mm), 1906.

A. SHAKER; PANTOGRAPH. APPLIOATIONIILBD JUNE 2, 1905.

-UNIT ED STAT13 PATENT OFFICE." ALFRED SHAKER, F? cnrcneo, ILLINOIS,

' AMoemeu.

Specification of Letters Patent.

Patented Jan. 30.. 1906.

Application filed June 2, 19(15- Serial No. 263,487-

,.To all whom, it may concern: I

Be it known that I, ALFRED SHAKER, a citi zen ofthe United States, and a resident of Chicago, county of Cook, and State of Illinois, have; invented certain new and useful Improvements in Pantographs, of which the forming apart thereof. IO-

The mvention relatesto a drafting instrumentwhich maybe employed for reproduc-,

ing from a co y upon a difierent scale, and

more specifica 1y tosuch a device in which an elastlc cord suitablyanchored adjacent one of its ends is secured to the drawing-pencil and carries a tracing-point for following the lines ofthecopy.

The invention consists in the construction and arrangement of parts to be hereinafter "with the accurate workin of the device, the

2, respectively.

object of the invention 'elng to provide a pantograph which shall be efficient in operation'and of simple and inexpensive construction.

4 v In the accompanying drawings, Figure 1 is a plan view'of the device, some of the parts being omitted. 1 1g. 2 is a side elevation of the same. Fig. 3 is a plan view showing a modified form of the device, some of the arts being broken away. Fig. 4 is a side e evation of the same. Figs. 5 and 6 area sectionaldetail and a detail'elevation, respectively, showing another modification in the construction; and Figs. 7 and 8 are sectional views on the lines 7 T of Flg. 3 and 8 8 of F g.

. Ananchor-plate for securing thedevice in position is shown at 15. It may be attached to adrawing-board in any desired manner, but preferably by, means of ordinary thumbtacks (not shown) passed through the apertures 16. A post 17 rises from the plate and is overturned at the top, as indicated at '18, and provided with an aperture 19 ferreceiving the hooked end 20 of an elastic cord. To tl opposito end of this cord is secured a 'draii ig-pencil 22, asshown in the drawings, a sleeve 23 iming provided for receiving the pencil and having near its lower end an aper 'structionshown in tured ear 24, into which a hook25, formed on the end of the cord, maybe inserted. In the preferred construction of thedevice (shown in Figs. 3,. 4, and. 7- of the drawings) the elastic cord takes the form of a coilspring 21,

A tracinggioint 26 for following e dehneations of the rawing to be copied is adjustably secured to the spring intermediate its ends'and dependstherefrom substantiallyto the plane of the drawin -board., It 1s rovided with'a shank 27, whic preferably ta es the form of a split tube adapted to frictionally engage the bodyof the spring.

It may bedesirable in some cases-as, for example, when the device is to be used indiscriminately for reproducing drawings of va- There may be employed for this v gs. 5 and 6, in which a clamp 28 for gripping the spring at any de- In-Figs. 1, 2, and 8 the elastic cord is shown as composed 'of two strands 29 30, preferablyof rubber or elastic fabricand of equal length.

'riou s sizes-to provide means for adjusting .the length of the spring .21.

gpirposethe form of con- ,sired point is formed at the top of the post 17.

The ends of both of these strands are secured spectively. A tracing-point (shown at 33) is sus ended from the elastic cord, it being prefera 1 carried by but one of the strands, as

29, t e other strand serving merely to prevent the overturning of the tracing-point'by the twisting of the strand to which it is socured. To this end the tracing-point 33- is provided with a shank 34, adapted to frictionally engage the strand 29 and having a I tubulareye 35 for loosely receiving the strand 30, as most clearly shown in Fig. 8.

In usin the device the drawing to be i copied an the paper upon which the reproduction is to be made are secured to the drawing-board within the range of the trac ing-point 26 or 3-3 and the drawing-pencil 22,. respectively, when theelastic cord is moderately strained. An accurate reproduction of the copy may then be drawn by so guiding the pencil that the tracing-point followsthe lines of the original, for while the length of throughout the operation. The scale of re-' the cord may change as the pencil is moved production may be changed by shifting the position of the tracing-point upon the cord, it being larger when the tracing point is placed nearer to the anchor-block 15.

As shown in the several figures of the draw ings, the tracing-point is intended to be supported in a vertical position over the original. It may, however, be made to lie flat upon the drawing-board by inserting the hooked end 20 of the elastic cord in an aperture 36, provided in the vertical portion of the post 17 near its base. v

It will be understood that by the use of a coil spring which does not twist when strained or by the use of the cord of elastic fabric constructed according to my invention I am enabled to support the tracing point in a convenient position for use without the employment of any means to support or guide it which drag upon the surface of the drawing to be copied.

In order that the tracing-point 33 may be used in the horizontal position previously described when the form of elastic cord illustrated in Figs. 1, 2, and 7 is employed, a ver tically-extended apertured lug 37 may be I provided on the pencil-holder 23 for receiving the hook 25.

- claim as my invention- 1. In a pantograph, in combination, an anhaving each of its ends connected respectively to one of such parts, one of the connections being adapted to prevent the rotation of the spring; and a tracing-point carried by the spring.

2. in a pantograph, combination, an anchor; a pencil holder; a coil-spring having each of its ends connected respectively to one of such parts, one of the connections being adapted to prevent the rotation of the spring a clip for frictionally engagin the spring; and a tracing-point carried by 51c clip.

- 3. In a-pantograph, in combination, an anchor; a pencil-holder; a longitudinally-elastic connecting member; a tracing-point carried by the elastic member; and 'hook-andeye connections for the elastic member with the anchor and pencil-holder, such connec- .tions being disposed to impart the desired direction to the tracing-point.

4. In a pantograph, in combination, an anchor, a pencil-holder, a coil-spring connect ing such parts, the connection between the spring and one of the parts'being by means of a hook and eye, and a tracing-point car ried by the spring.

- ALFRED SHAKER.

Witnesses: Y

CI-IARLEs B. GILLSQN, E. M. KLATOHER. 

